Which statement describes the formation of the Milky Way galaxy?
A. A disk formed of long trails of stars coiled into a spiral.
B. It formed an elliptical flattened disk
C. Heat and gases contracted within a nebula.
D. Gravity pushed stars away from a center core.

Write a short paragraph of about 150-300 words. explain how the physical environment can limit human activities.

The capital of australia was located a. on a south-facing harbor d. between its two largest cities g. near the great barrier reef j. close to asia

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks